valid under Jewish law.

Kasher - to make kosher, usually applied to the salting and soaking procedures used in the production of kosher meat and poultry. The term is also used to describe the kosherization procedure of a non-kosher facility or utensil, so that it may be used in the preparation of kosher food.

(Hebrew, "fit"). Fit for ritual use. Also a verb meaning "to make a food or object fit for ritual use." See Jewish Practices: Dietary Laws.